I'm sure the three I want to take are math iic, physics, and writing, im just wondering if it would be too much to take all 3 together in june or wait and spread them out. I'm in pre-calc, and my 1st year of physics right now. Is it common to take that many in one day, since i will be studying for my exams in those respective classes during the same time, i'm hoping it won't be too bad. I just really wanna get all my testing over with

I've taken 3 in one day and it's about as taxing as a regular SAT (more break time but it takes a little stamina to keep yourself from becoming careless.) If you can prep for that many exams then go for it. If you think you can only focus on practicing 1-2 subjects at a time then hold off on that many tests. You can always wait.